Process of forming bodies by electrodeposition.



N0. 693,9l8. Patented Feb. 25, I902,

-C. SIE'INWEG: PROCESS OF FORMING BODIES BY ELEOTRODEPOSITIQN.

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CARL STEINWEG, OF LUDENSOHEID, GERMANY.

SPECIFICATION formingpart of Letters I'atent No. 693,918, dated February 25, 1902.

Application filed July 1, 1901. Serial No. 66,776- (No specimens.)

To all whom it may concern:

Be it known that I, CARL STEINWEG, a subj ect of the King of Prussia, German Emperor, and a resident of Liidenscheid,in the Province of WestphaliaGerman Empire,have invented a new and useful Process of Forming Bodies by Electrodeposition, of which the following is an exact specification.

My invention relates to a process of forming bodies by electrodeposition, and has especially for its purpose to provide metal matrices which can be easily separated from the precipitated metals.

The known processes for separating the galvanoplastic precipitates from the matrices cannot always be advantageously used for the nickel galvanoplastic, especially if the nickel shall be precipitated around a matrix which is not flat, but forms a hollow or curved body. The matrices, consisting of wax, rubber, or the like easily-fusible materials, cannot be used for the electrodeposition of nickel, as thick nickel layers can only be attained in case the nickel solutions are hot,in which case the materials mentioned above would melt or get soft and be deformed. Another kind of matrices used up to now, consisting in matrices'manufactured from easily-fusible metals which are separated from the precipitate afterward by melting these metals, have the great disadvantage that the easily-fusible metal alloys with the precipitating metal, so that the surface of the same will never be clean and pure. Only the third of the well-known processes-that is to say, the use of matrices manufactured of hard metal, as copper, iron, brass, and the likecan advantageously be used in the nickel galvanoplastic; but it is clear that by means of such matrices only very simple flat objects or flat hollow bodies, as cylinders, cylindrical pipes, &c., can be manufactured, in which case the core is taken off either by making the core narrower or making the precipitated body wider by hammering, rolling, pressing, or the like. The process cannot be used for manufacturing all other kinds of bodies, especially hollow bodies with narrow openings and the like. By the process forming the object 'of this invention it is attained that such bodies of any form can easily be manufactured. This object is attained by using matrices of very thin and soft metal plates which can easily be torn, and the back side of which is provided with grooves or the like.

In order to make my invention more clear, I refer to the accompanying drawings, in which Figure 1 shows a matrix constructed according to my invention. Fig. 2 is a horizontal section of the same on lines A B of Fig. 1. Fig. 8 is a vertical section of the same with the precipitated metal aroundthe same, showing how the strips of the matrix are torn out after the precipitation of the metaL- Fig. 4 is a vertical section of a cylindrical pipe provided with spiral-formed grooves.

The grooves a, which go perfectly across the matrix, divide the walls of the same in several strips or divisions b, which after the metal 01 is precipitated around the matrix can be torn out. By the divisions 1), formed by the grooves a, it is attained that the metal sheets can be easily separated from the precipitated metal d without a deformation of this metal taking place.

The matrices are advantageously manufactured of lead, tin, or metal alloys-as, for instance, britannia metal. In case the matrix is manufactured of metal plates these plates are advantageously run through a pair of rollers, one of which is smooth, While the other is provided with annular projections around the same, or a steel plate provided with ribs is laid upon the metal plate to be used and is run through two smooth rollers together with the same, so that the ribs will be pressed into the metal plate. In case the matrices are cast, the grooves may easily be manufactured by providing the core of the mold with ribs. It is also possible to manufacture the grooves by cutting the same by means of a tool fit for the purpose, or manufacturingthe same on a lathe, shaping-machine, milling-machine, or the like. The grooves may be manufactured before the precipitation of the metal or after the same. As to the form of the grooves, it will be advantageous to divide the matrix in several parallel strips, which can easily be torn off,or in cylindrical bodies it may be practical to provide grooves e in a spiral form, as shown in Fig. 4, so that the whole matrix can be torn out in form of one spiral-formed strip. In case of very complicated matrices it Will be necessary to subdivied, sometimes, of the matrix, and tearing out'the several seethe strips. I tions of the same, substantially as set forth. Having thus fully described the nature of In testimony whereof I have signed my this invention, what Idesire to secure by Letname to this specification in the presence of 5 ters Patent of the United States istwo subscribing witnesses.

A process of forming bodies by eieetrodep- T osition, consisting in providing sheet-metal CARL STEIN matrices, partially dividing the same in several sections by a series of grooves, electro- 1o depositing the metal upon the smooth surface l Witnesses:

WM. ESSENWEIN, PETER LIEBER. 

